You will arrive at your destination when the driver decides your time of arrival. Usually used by stubborn nazis who do not know how to drive fast. May also be used as a method to stall if you are lost.

Kids in the back seat: Dad, we've been driving for 2 hours, it was only supposed to take an hour to get to the park.

Dad: You get there when you get there!

Kids in the back seat: That doesn't tell us anything, when are we going to get there!